What is the origin of Indian weekday names?Also, do you realize how nonsensical your comments are? "Why are the weekdays named in that order?" "Because the grahas were ordered that way." "How do we know the grahas were ordered that way?" "Because the weekdays are named in that order." Your reasoning is circular.

May31

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What is the origin of Indian weekday names?They were called the Navagraha (nine graha) for a reason. Rāhu and Ketu, which we'd call lunar nodes today, were considered heavenly bodies on par with the other seven by ancient Indians. If the week was inspired by Indian astrology (which I'm fairly sure it wasn't), we should have had a nine-day week not a seven-day one.

May31

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What is the origin of Indian weekday names?Nice answer, now prove you didn't make it up. Where's the evidence that (a) ancient Indians considered that to be the order of the Navagraha and (b) the order of weekdays was derived from the order of the Navagraha, and not the other way round? A Navagraha-based answer would raise questions about (a) why the Indian week has seven days instead of nine (b) why the Greeks used to same sequence of weekdays, even though they assigned the heavenly bodies a different order (ctrl-F Chaldean)

What is the origin of Indian weekday names?Interesting, but how is that relevant? The question wasn't about the Norse names. The fact remains that (except in Sanskrit) the Indian days are named after the same celestial bodies as the corresponding Graeco-Roman days, even if the gods associated with those bodies are not perfectly equivalent.